weston Posted March 29, 2018 Share Posted March 29, 2018 Morning How do I calculate the DP of a spur gear? Cheers Mike Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Wrighty8766 Posted March 29, 2018 Share Posted March 29, 2018 I think it’s to do with how many teeth there are per mm, a mod 1 gear would have 1 tooth every mm. i may be wrong though Quote Link to comment Share on other sites More sharing options...
Wrighty8766 Posted March 29, 2018 Share Posted March 29, 2018 What car is it in? Quote Link to comment Share on other sites More sharing options...
weston Posted March 29, 2018 Author Share Posted March 29, 2018 It's in an hpi bullet.Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Wrighty8766 Posted March 29, 2018 Share Posted March 29, 2018 They use mod 1 as far as I know Quote Link to comment Share on other sites More sharing options...
weston Posted March 29, 2018 Author Share Posted March 29, 2018 That's roughly what in pitch 25?Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
RCbutcher Posted March 29, 2018 Share Posted March 29, 2018 (edited) Mod 1.0 biggest 1/8 scale usually. Nitro too. 32dp or Mod 0.8 / 1/10 usually 48dp 1/10 light weight on roads. 2wd off road electric rc. Idk which the bullet uses. Is yours nitro or electric? The spurs i just seen look 32dp mod 0.8. But would be best to confirm with other owner mate. Saves waiting for wrong peice. Esp if nitro elec varies. Edited March 29, 2018 by RCbutcher Quote Link to comment Share on other sites More sharing options...
weston Posted March 29, 2018 Author Share Posted March 29, 2018 Mod 1.0 biggest 1/8 scale usually. Nitro too. 32dp or Mod 0.8 / 1/10 usually 48dp 1/10 light weight on roads. 2wd off road electric rc. Idk which the bullet uses. Is yours nitro or electric? The spurs i just seen look 32dp mod 0.8. But would be best to confirm with other owner mate. Saves waiting for wrong peice. Esp if nitro elec varies. Thanks RCB, it's a nitro bullet, which I'm converting to brushless. Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Wrighty8766 Posted March 29, 2018 Share Posted March 29, 2018 (edited) I’m guessing it’s the flux with you asking in the electric section, they use a mod 1 3mm (3.17mm actually) bore pinion. I’m not sure what the pitch of that is in imperial terms though sorry edit, wrote this before your last reply popped up Edited March 29, 2018 by Wrighty8766 Quote Link to comment Share on other sites More sharing options...
Wrighty8766 Posted March 29, 2018 Share Posted March 29, 2018 Looks like it might be .8dp if your converting it to flux then it might be an idea to use the centre diff off the wr8 flux to protect the front and rear diffs a little Quote Link to comment Share on other sites More sharing options...
weston Posted March 29, 2018 Author Share Posted March 29, 2018 Thanks. Out of interest, why would I change to the wr8 diff? Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
weston Posted March 29, 2018 Author Share Posted March 29, 2018 I’m guessing it’s the flux with you asking in the electric section, they use a mod 1 3mm (3.17mm actually) bore pinion. I’m not sure what the pitch of that is in imperial terms though sorry edit, wrote this before your last reply popped up [emoji4]That’s were the fun starts. It’s a nitro converted to a brushless, likely to be 5mm bore pinion. Sent from my iPad using Tapatalk Quote Link to comment Share on other sites More sharing options...
Wrighty8766 Posted March 29, 2018 Share Posted March 29, 2018 1 hour ago, weston said: Thanks. Out of interest, why would I change to the wr8 diff? Sent from my SM-G950F using Tapatalk If I remember correctly the bullet has a centre slipper not a centre diff? a centre diff is a much better option when compared to a slipper as it transfers the power to the front/rear much better when the drivetrain is under stress which is essential when running a high torque brushless motor. 38 minutes ago, weston said: That’s were the fun starts. It’s a nitro converted to a brushless, likely to be 5mm bore pinion. Sent from my iPad using Tapatalk The bore will depend on what motor you have. In my opinion a lower KV long can on 3s would be perfect in a bullet. something like this Quote Link to comment Share on other sites More sharing options...
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